N. SUBRAMANIAM BOOK OF RCC DESIGN GAVE THIS SYNTEX
*SCALE FACTOR = (0.16/2) × (1.5 / 5) = 0.024SPECTRUM CQC 1893 X 2.078 ACC SCALE 0.024 DAMP 0.05 MISSOIL TYPE 2
IN THIS CASE ACC SCALE VALUE IS CALCULATED USING Z/2*I/R BUT IN STAAD HELP CONTENT VALUE OF SCALE FACTOR IS DEFINED AS "Linear scale factor by which the spectra data will be multiplied. Usually used to factor g’s to length/sec2 units. This input is the appropriate value of acceleration due to gravity in the current unit system (thus, 9.81 m/s2 or 32.2 ft/s2)".
WHICH ONE IS CORRECT?
It can not be said wrong directly, as the book is not a help content of STAAD. But in STAAD Scale is used when user provides data for ground acceleration. Normally for codes, scale should be used 1 as already 'g' value has been multiplied internally with ground acceleration data. If the data are not normalized then you can use scale to normalize the same.